Web Reference: Jan 19, 2026 · JavaScript data types define what kind of values a variable can hold and how those values behave in a program. They determine how data is stored in memory and how operations like comparison, calculation, and conversion work. A JavaScript variable can hold 8 types of data. 7 Primitive Data Types and 1 Object Data Type. The Object data type can hold many different object types. This guide explores each type in depth, explains how JavaScript's dynamic type system works, and covers the critical difference between how primitives and objects are stored in memory.
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